gpio: omap: Improve a size determination

Replace the specification of a data structure by a pointer dereference
as the parameter for the operator "sizeof" to make the corresponding size
determination a bit safer according to the Linux coding style convention.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Acked-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-omap.c

@@ -1157,7 +1157,7 @@ static int omap_gpio_probe(struct platform_device *pdev)
 	if (!pdata)
 		return -EINVAL;
 
-	bank = devm_kzalloc(dev, sizeof(struct gpio_bank), GFP_KERNEL);
+	bank = devm_kzalloc(dev, sizeof(*bank), GFP_KERNEL);
 	if (!bank)
 		return -ENOMEM;